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How many cubic metres of earth must be dug-out to sink a well 21 m deep and 6m diameter?

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How many cubic metres of earth must be dug-out to sink a well 21 m deep and 6m diameter?

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We have,

Height of cylinder = 21m

Diameter of well = 6m

Radius of well = d/2 = 6/2 = 3m

Then,

∴ Volume of earth that must be dug out from this well = πr2h

= 22/7 × 3 × 3 × 21

= 594 m3

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